/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.cloud.all.security.access.vote;

import java.util.Collection;

import cn.cloud.all.security.access.RoleHierarchy;
import cn.cloud.all.security.core.Authentication;
import cn.cloud.all.security.core.GrantedAuthority;
import org.springframework.util.Assert;

/**
 * Extended RoleVoter which uses a {@link RoleHierarchy} definition to determine the roles
 * allocated to the current user before voting.
 *
 * @author Luke Taylor
 * @since 2.0.4
 */
public class RoleHierarchyVoter extends RoleVoter {
    private RoleHierarchy roleHierarchy = null;

    public RoleHierarchyVoter(RoleHierarchy roleHierarchy) {
        Assert.notNull(roleHierarchy, "RoleHierarchy must not be null");
        this.roleHierarchy = roleHierarchy;
    }

    /**
     * Calls the <tt>RoleHierarchy</tt> to obtain the complete set of user authorities.
     */
    @Override
    Collection<? extends GrantedAuthority> extractAuthorities(Authentication authentication) {
        return roleHierarchy.getReachableGrantedAuthorities(authentication.getAuthorities());
    }
}
